Method of making a cathode from tungsten powder

摘要

A cathode is made from tungsten powder using as an impregnant the product formed from adding about 1 mole of a member selected from the group consisting of zirconium, zirconium dioxide, hafnium, hafnium dioxide, uranium, uranium dioxide, titanium, and titanium dioxide to about 50 to about 100 moles of a compound selected from the group consisting of Ba3Al2O6, Ba3WO6, and Ba4Al2O7.